Sheet #3

1. A cellular network uses a frequency reuse factor of 9 and with 1000 channels available in the system. The radius of the cell is 1.5Km and the total coverage is 1200 Km2.a. Calculate the i and j values used in deciding the frequency reuse factor.b. Find the total number of users that can be supported by the network.c. Draw the cellular constellation for such network.d. Calculate the SIR for a path loss 2 for each of the frequency reuse factors indicated above.

2. Repeat question one for frequency reuse 1, 3, 4, 12,13,19.

3. Compare hexagonal and square cellular systems in terms of Reuse Distance (D) and reuse factor (q).

4. Compare hexagonal and square cellular systems in terms of CIR generated from the closest interfering base stations. In both lattices the reuse pattern N = 4 is possible, hence assume that, and calculate the interference to a user located at the cell edge when the path loss exponent gets values between 1,5 and 6. Keep the cell areas equal in both cases.

5. If a Signal to Interference ratio of 15 dB is required for satisfactory forward channel performance of a Cellular system, what is the frequency reuse factor and Cluster Size that should be used for maximum capacity if the path loss exponent is (i) 3 , (ii) 4. Assume that there are six co-channel cells in the first tier and all of them are there at the same distance from the mobile.

6. Consider a cellular system with 100 cells, a frequency reuse factor of 7, and 500 overall two way Channels, Calculate the following :a. Number of channels per cell,b. Total no. of channels available to the service provider,c. Minimum C/I Ratio of the system in dB at ( path loss exponent = 3)

COLLEGE OF ENGINEERING & TECHNOLOGY

Department : Electronics& Communication Engineering

Course Title : Mobile Communication Course Code: EC521

Lecturer : Dr.Mohamed Esam Khedr

T.A : Eng.Abdusalam Adham Term: September-2012